code: def test_string_response(self):
      response = self.df.chat("address of cheapest property")
      self.assertEqual(response, "635 W 170th St Apt 4F")
  
file_path: pandas-ai/integration/test_new_york_housing_market.py
imports: import os
  import unittest
  from pandasai import SmartDataframe
  from pandasai.llm import OpenAI
label_desc: Use image node_id 4 for calling the TestNewYorkHousing obj's underlying member method code with example usage: obj.test_string_response() without return types